724644 has 18 divisors (see below), whose sum is σ = 1831830. Its totient is φ = 241536.

The previous prime is 724643. The next prime is 724651. The reversal of 724644 is 446427.

It can be written as a sum of positive squares in only one way, i.e., 705600 + 19044 = 840^2 + 138^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (724643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10029 + ... + 10100.

2⁷²⁴⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

724644 is an abundant number, since it is smaller than the sum of its proper divisors (1107186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

724644 is a wasteful number, since it uses less digits than its factorization.

724644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20139 (or 20134 counting only the distinct ones).

The product of its digits is 5376, while the sum is 27.

The square root of 724644 is about 851.2602422291. The cubic root of 724644 is about 89.8203825076.

The spelling of 724644 in words is "seven hundred twenty-four thousand, six hundred forty-four".